Putting an old HD in a new PS3 without formatting

[ghettoglamour]

Navane said:
Keep in mind that you need to have registered your old PS3 on PSN, and then confirm it on your new PS3. I never connected my old PS3 to PSN, and when I backed up all my data and transferred it over, I basically lost all my saves as my pre-existing profile thought these saves were from another owner.

So all the trophies I had and all the progress I made were undone. Don't make the same mistake as me.

You mean connected to the PSN for the trophies. Yes it logs in to PSN when it starts, my trophies are on PSN (look at my sig). But why is it important to register my PS3 on PSN? Haven't done it yet.